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  Subjects -> CHEMISTRY (Total: 842 journals)
    - ANALYTICAL CHEMISTRY (50 journals)
    - CHEMISTRY (594 journals)
    - CRYSTALLOGRAPHY (21 journals)
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ANALYTICAL CHEMISTRY (50 journals)

Showing 1 - 50 of 50 Journals sorted alphabetically
Accounts of Chemical Research     Full-text available via subscription   (Followers: 111)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 29)
American Journal of Analytical Chemistry     Open Access   (Followers: 32)
Analytica Chimica Acta     Hybrid Journal   (Followers: 38)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 28)
Analytical Chemistry     Full-text available via subscription   (Followers: 262)
Analytical Chemistry Insights     Open Access   (Followers: 22)
Analytical Chemistry Research     Open Access   (Followers: 8)
Analytical Letters     Hybrid Journal   (Followers: 11)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 11)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 10)
Biomonitoring     Open Access   (Followers: 2)
Chemical Data Collections     Hybrid Journal  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 3)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 2)
Composites Communications     Full-text available via subscription  
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 5)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 26)
Current Analytical Chemistry     Hybrid Journal   (Followers: 8)
Drug Testing and Analysis     Hybrid Journal   (Followers: 6)
Electroanalysis     Hybrid Journal   (Followers: 6)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 4)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 2)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription   (Followers: 1)
International Journal of Analytical Chemistry     Open Access   (Followers: 22)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 3)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 7)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 7)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 6)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 10)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 22)
Journal of Combinatorial Chemistry     Full-text available via subscription  
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 5)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 2)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 5)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 23)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 1)
Microchemical Journal     Hybrid Journal   (Followers: 3)
Nigerian Journal of Chemical Research     Full-text available via subscription  
Phytochemical Analysis     Hybrid Journal   (Followers: 2)
Polish Journal of Chemical Technology     Open Access   (Followers: 1)
Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 10)
Sample Preparation     Open Access  
Surface and Interface Analysis     Hybrid Journal   (Followers: 14)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 5)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 52)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 2)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 13)
World Journal of Analytical Chemistry     Open Access   (Followers: 1)
Journal Cover Journal of Analytical Chemistry
  [SJR: 0.268]   [H-I: 23]   [22 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
   Published by Springer-Verlag Homepage  [2353 journals]
  • Subcritical water: Use in chemical analysis
    • Authors: D. R. Borisova; M. A. Statkus; G. I. Tsizin; Yu. A. Zolotov
      Pages: 823 - 836
      Abstract: Abstract The review shows prospects of the use of subcritical water instead of organic solvents and aqueous–organic mixtures at different stages of analysis. Subcritical water was applied to the extraction of target compounds from natural samples, such as soils, sand, and plant raw materials. The use of subcritical water expands possibilities of HPLC. The use of subcritical water as an eluent in HPLC is complicated by the possible destruction of the adsorbent and the decomposition of substances to be determined at elevated temperatures. Adsorbents based on zirconium and titanium oxides, some polymeric adsorbents, and porous graphitized carbon are stable in the medium of subcritical water. Subcritical water can be used at several stages of analysis, for example, for the extraction and subsequent chromatographic separation of analytes.
      PubDate: 2017-08-01
      DOI: 10.1134/s1061934817080044
      Issue No: Vol. 72, No. 8 (2017)
       
  • Using Sorbents modified by gold nanoparticles in chromatography
    • Authors: I. A. Anan’eva; Ya. A. Polyakova; E. N. Shapovalova; O. A. Shpigun
      Pages: 837 - 848
      Abstract: The use of sorbents modified by metal nanoparticles in HPLC for the separation of various organic substances is discussed.
      Authors ’ data on the synthesis and study of silicas modified by gold nanoparticles stabilized by organic ligands are summarized. A possibility of the successful separation of nitroaniline, aminopyridine, hydrazines, water-soluble vitamins, β-blockers, and their enantiomers on the synthesized sorbents is shown.
      PubDate: 2017-08-01
      DOI: 10.1134/s1061934817080020
      Issue No: Vol. 72, No. 8 (2017)
       
  • Group preconcentration of ions from acid aqueous solutions with a
           low-melting extractant
    • Authors: S. V. Temerev; B. I. Petrov; Yu. P. Savakova
      Pages: 849 - 853
      Abstract: Abstract A possibility of the analytical application of a low-melting extractant, antipyrinium acetylsalicylate, to the extraction of a number of ions from acid aqueous solutions is studied. The distribution of Al, As, Cd, Co, Cr, Cu, Fe, Mg, Mn, Mo, Ni, Pb, Sb, Sn, Ti, V, and Zn ions between the aqueous solution and an organic extractant is studied by atomic emission spectrometry. The efficiency of ion extraction from acid solutions with a low-melting flux of antipyrinium acetylsalicylate is calculated. It is shown that single extraction with an extractant flux ensures the efficient extraction of Fe, Mo, Sn, and Ti from the water phase of the analyzed solution to the flux. The introduction of chloride ions into the analyzed acid aqueous solution significantly increases the efficiency of the group preconcentration of ions by the ion-exchange mechanism.
      PubDate: 2017-08-01
      DOI: 10.1134/s1061934817080123
      Issue No: Vol. 72, No. 8 (2017)
       
  • Determination of ecdysteroids in Fornicium unflorum (L.) and Serratula
           centauroides (L.) raw materials by chromatography–UV spectrophotometry
    • Authors: I. G. Nikolaeva; L. P. Tsybiktarova; L. L. Garmaeva; G. G. Nikolaeva; D. N. Olennikov; I. E. Matkhanov
      Pages: 854 - 861
      Abstract: Abstract A chromatography–spectrophotometry method is developed for determining total ecdysteroids in terms of 20-hydroxyecdysone in Serratula centauroides (L.) and Fornicium unflorum (L.) raw materials, based on the purification of extracts from the plant raw materials with aluminum oxide and subsequent spectrophotometric determination relative to a 20-hydroxyecdysone reference sample. Ecdysteroids were determined in plants by HPLC; rhapontisterone and turkesterone are found in F. uniflorum for the first time.
      PubDate: 2017-08-01
      DOI: 10.1134/s1061934817080093
      Issue No: Vol. 72, No. 8 (2017)
       
  • Fast SPE and HPLC–DAD determination of brucine in human urine using
           multi-walled carbon nanotubes modified with magnetic nanoparticles
    • Authors: Zufei Feng; Rong Yang; Baozhong Du
      Pages: 862 - 869
      Abstract: Abstract A nanomaterial comprising Fe3O4-modified hydroxylated multi-walled carbon nanotubes (Fe3O4–MWCNTs–OH) was prepared by a co-precipitation method. Combined with HPLC-photodiode array detector (DAD), Fe3O4–MWCNTs–OH was used to determine brucine in human urine. Some important parameters that could influence extraction efficiency of brucine were optimized, including the extraction time, amounts of Fe3O4–MWCNTs–OH, pH of sample solutions, desorption solvent and desorption time. Under the optimal conditions, the recoveries of brucine from spiked urine samples were between 93.1 and 104.1%, and the relative standard deviations (RSDs) ranged from 3.1 to 5.7%. The correlation coefficient was 0.9997. The limits of detection and quantification were 6 and 21 ng/mL at a signal-to-noise ratio of 3 and 10, respectively. The results indicated that Fe3O4–MWCNTs–OH combined with HPLC–DAD is a promising solid-phase extraction material for the sample pretreatment in the determination of brucine.
      PubDate: 2017-08-01
      DOI: 10.1134/s1061934817080159
      Issue No: Vol. 72, No. 8 (2017)
       
  • Thin-layer chromatography of some amino acids on silica in
           aqueous–organic and modified micellar mobile phases
    • Authors: S. N. Shtykov; E. G. Sumina; V. Z. Uglanova; O. N. Sorokina
      Pages: 870 - 878
      Abstract: Abstract Chromatographic behavior of some amino acids in aqueous–organic and aqueous modified micellar mobile phases is studied by thin-layer liquid chromatography. Intrinsic basic laws, features, possibilities, and limitations are revealed. It is shown that the efficiency of the chromatographic separation of amino acids in the presence of electrolytes is significantly improved in micellar mobile phases.
      PubDate: 2017-08-01
      DOI: 10.1134/s1061934817080111
      Issue No: Vol. 72, No. 8 (2017)
       
  • HPLC determination of glucosamine hydrochloride and chondroitin sulfate,
           weakly absorbing in the near UV region, in various buffer media
    • Authors: V. M. Kosman; M. N. Karlina; O. N. Pozharitskaya; A. N. Shikov; V. G. Makarov
      Pages: 879 - 885
      Abstract: Abstract Some features of the HPLC determination of two hydrophilic substances that poorly absorb in the UV spectral region (chondroitin sodium sulfate and glucosamine hydrochloride), associated with the absorption in the near UV region (195 nm) of components of buffer solutions with different pH values (1.2, 4.5, and 6.8), are considered. Such solutions are used, for example, in comparative dissolution kinetics tests in pharmaceutical practice. At some pH, the subtraction of the areas of system peaks from the total areas of analyte peaks made it possible to compensate for the negative effect of the solvent. To determine glucosamine hydrochloride in 0.1 M HCl, a procedure was developed and validated, involving the synthesis of o-phthalic derivatives. The revealed analytical features are caused by that the solvent of the samples and the eluent do not match; the effect can be most pronounced in measurements in the near UV region and in the determination of ionic compounds.
      PubDate: 2017-08-01
      DOI: 10.1134/s106193481708007x
      Issue No: Vol. 72, No. 8 (2017)
       
  • Determination of N -acetylneuraminic acid in poultry eggs by ultra
           performance liquid chromatography–tandem mass spectrometry
    • Authors: Y. Li; W. Wang; X. L. Gou; N. Lin; S. F. Le; N. Du; H. Yan; J. H. Zhang
      Pages: 886 - 889
      Abstract: Abstract N-acetylneuraminic acid is an important member of sialic acids which is a family of nine-carbon carboxylated sugars most frequently found in terminal position in glycoconjugates. It was widely distributed in different portions of organisms. In this study, a method of ultra performance liquid chromatography–tandem mass spectrometry was developed for the determination of N-acetylneuraminic acid in poultry eggs. The N-acetylneuraminic acid was freed by heating the materials in 0.1 M H2SO4 at 80°C for 2 h. Then, chloroform reagent was used to eliminate phospholipids, cholesterol and other organic impurities, meanwhile, it was able to precipitate protein. In the cleanup step, C18 solid phase extraction columns were used to purify the matrix. Determination of N-acetylneuraminic acid was performed with electrospray ionization in negative ion mode. Chromatographic separation was performed on a Waters Acquity UPLC BEH C18 (100 × 2.1 mm, 1.7 μm) analytical column. The gradient elution reagent was acetonitrile and water (containing 0.1% formic acid). The tandem spectrometer was operated in the Multiple Reaction Monitoring mode. The linearity over of sialic acids on-column had a correlation coefficient greater than 0.999. The detection method of N-acetylneuraminic acid in the poultry eggs had good precision and acceptable recovery.
      PubDate: 2017-08-01
      DOI: 10.1134/s1061934817080081
      Issue No: Vol. 72, No. 8 (2017)
       
  • Determination of trace amounts of chlorobenzenes in water using
           membrane-supported headspace single-drop microextraction and gas
           chromatography–mass spectrometry
    • Authors: Xiao Ma; Jun Ma
      Pages: 890 - 896
      Abstract: Abstract A novel method based on the coupling of membrane-supported headspace single-drop microextraction with gas chromatography‒mass spectrometry (GC–MS) is developed for the determination of chlorobenzenes in water samples. For the determination of five chlorobenzenes, a 15 μL toluene microdrop was placed inside the plastic membrane and exposed for 10 min for headspace extraction while stirring at 1000 rpm. The microdrop was then picked up by a microsyringe and directly injected into the injector block of the GC–MS instrument. Under the optimized operation conditions, the calculated calibration curves gave a high level of linearity for all targets with correlation coefficients range from 0.9945 to 0.9987. The limits of detection range from 0.01 to 0.05 μg/L and the RSDs for most of chlorobenzenes were below 7%. The method is simple, sensitive, and stable for single drop microextraction. Its applicability is demonstrated by the determination of chlorobenzenes in tap water samples.
      PubDate: 2017-08-01
      DOI: 10.1134/s1061934817080135
      Issue No: Vol. 72, No. 8 (2017)
       
  • Fabrication of poly(4-aminobenzoic acid/ o -toluidine) modified carbon
           paste electrode and its electrocatalytic property to the oxidation of
           nitrite
    • Authors: B. Norouzi; M. Rajabi
      Pages: 897 - 903
      Abstract: Abstract The poly(4-aminobenzoic acid/o-toluidine) (4-AB/OT) modified carbon paste electrode (CPE) was fabricated by consecutive cyclic voltammetry. The poly(4-AB/OT) CPE shows catalytic activity for the oxidation of nitrite in 0.1 M phosphate buffer solution (pH 7). Due to the electrostatic interaction between the negatively-charged nitrite ions and the positively-charged poly(4-AB/OT) film, the operating potential for nitrite oxidation was shifted about 240 mV to negative side, compared to bare CPE. The catalytic peak current was found to be linear with the nitrite concentration in the range of 6–600 μM, with a correlation coefficient of 0.981, using amperometry. The sensitivity and limit of detection for the poly(4-AB/OT) CPE are about 187.4 μA/mM and 3.5 μM, respectively. The possible interferences from several common ions were tested. The developed sensor was also successfully applied to the determination of nitrite concentration in a mineral water sample.
      PubDate: 2017-08-01
      DOI: 10.1134/s106193481708010x
      Issue No: Vol. 72, No. 8 (2017)
       
  • Voltammetric determination of cholesterol in human blood serum
    • Authors: K. V. Derina; E. I. Korotkova; E. V. Dorozhko; O. A. Voronova
      Pages: 904 - 910
      Abstract: Abstract Cholesterol has a number of important functions in a human body. The disorders of cholesterol biosynthesis increase the risk of the development of cardiovascular diseases and worsens the function of the immune system. This study is devoted to the development of a method for determining the concentration of cholesterol in blood serum using voltammetry. We selected the following working conditions for the determination of cholesterol: a phosphate buffer solution with pH 6.86 was a supporting electrolyte; potential sweep rate was W = 30 mV/s; and recording was carried out in the constant-current mode. An organomodified electrode was used as a working electrode. The peak was observed at +0.98 V. The dependence of the electrooxidation current of cholesterol on its concentration was linear in the range of 0.1–50 μM with a limit of detection of 0.01 μM. The results of the determination of cholesterol in blood serum by voltammetry were compared to those obtained by the fluorimetric method.
      PubDate: 2017-08-01
      DOI: 10.1134/s1061934817080068
      Issue No: Vol. 72, No. 8 (2017)
       
  • Determination of the oxidant activity of chlorinated water by
           chronoamperometry
    • Authors: Kh. Z. Brainina; A. V. Tarasov; M. Ya. Khodos
      Pages: 911 - 916
      Abstract: Abstract A new version of the chronoamperometric method, adapted to the determination of the oxidative (oxidant) activity of a medium on an example of chlorinated water, was proposed. The supporting solution contained K4Fe(CN)6. By its oxidation with oxidants present in the sample, K3Fe(CN)6 formed; its reduction current served as an analytical signal. The current of K3Fe(CN)6 reduction was recorded at a potential of 0 V, selected from the cyclic voltammogram of the K3Fe(CN)6/K4Fe(CN)6 system in the range where the oxidized form of the reagent was reduced and the reduced form was stable. A gold electrode was the measuring electrode. The possibility of using a stable solution of K3Fe(CN)6 as a component of a standard addition and as a solution for plotting a calibration curve was demonstrated. The limit of detection of the amount of dissolved chlorine and products of its interaction with water is 8 × 10–6 M. The data obtained by the proposed procedure and by the iodometric methods correlate well with each other (r = 0.93–0.95). The proposed version of the chronoamperometric method can be used to monitor the amount of dissolved chlorine and products of its interaction with water in water supply systems, pools, and disinfecting solutions and to determine other water-soluble oxidants.
      PubDate: 2017-08-01
      DOI: 10.1134/s1061934817080056
      Issue No: Vol. 72, No. 8 (2017)
       
  • Capabilities of the electrochemical methods in the determination of
           narcotic and psychotropic drugs in forensic chemistry materials
    • Authors: G. B. Slepchenko; T. M. Gindullina; S. V. Nekhoroshev
      Pages: 703 - 709
      Abstract: Abstract A survey of the capabilities of electrochemical methods for the separation (capillary electrophoresis) and determination (amperometry, the versions of voltammetry, and potentiometry) of narcotic and psychotropic drugs and their metabolites, which are of interest in criminological practice, as the constituents of biological materials (hair, blood, and urine) and medicinal preparations is presented.
      PubDate: 2017-07-01
      DOI: 10.1134/s1061934817070127
      Issue No: Vol. 72, No. 7 (2017)
       
  • Stoichiographic determination of the composition and concentration of
           phases encapsulated in the bulk of a solid matrix phase
    • Authors: A. A. Pochtar; V. V. Malakhov
      Pages: 719 - 723
      Abstract: Abstract A two-step method of stoichiographic calculations used in the determination of the formulas of phases encapsulated in the bulk of matrices of another composition is proposed. At the first stage of calculations, the stoichiometric composition of the encapsulated phase is determined and, at the second step, the concentrations of this phase and the matrix are found. The use of this method in the analysis of oxide La–Cu catalysts by the method of differential dissolution ensures the detection of the phase La1Cu1 (La2Cu2O5), incorporated within the matrix La1Cu0.5 (La2CuO4) phase.
      PubDate: 2017-07-01
      DOI: 10.1134/s1061934817070097
      Issue No: Vol. 72, No. 7 (2017)
       
  • Color reactions of vanadium(V) with 8-hydroxyquinoline-5-sulfonic acid and
           ascorbic acid on PANV–AV-17 disks
    • Authors: O. P. Shvoeva; V. P. Dedkova; A. A. Grechnikov
      Pages: 734 - 738
      Abstract: Abstract The adsorption of vanadium(V) and 8-hydroxyquinoline-5-sulfonic acid (HQS) on polyacrylonitrile fiber disks filled with an AV-17 (PANV–AV-17) anion exchanger is studied by diffuse reflection spectroscopy. Vanadium(V) at pH 5‒7 is adsorbed on PANV–AV-17; when a HQS solution is applied to the disk, a yellowish green complex compound formed, which changed color to almost black after the treatment of the disk with a HCl solution. The presence of sulfo groups in the HQS molecule ensures the preconcentration of the reagent on PANV–AV-17 disks with the registration of an analytical signal after the treatment of the disk with NaVO3 and 0.1 M HCl solutions. A linear dependence of the analytical signal is observed in the HQS concentration range of 1‒10 μg/mL. The presence of 20-fold amounts (by weight) of 8-hydroxyquinoline (HOQ) does not interfere with the determination. When ascorbic acid is applied to the disk with a vanadium(V)‒HQS‒HCl complex, the color changes from black to green. A test method for the determination of ascorbic acid is proposed. 8-Hydroxyquinoline can be determined by the intrinsic color of the adsorbate on PANV–KU-2 in the range of concentrations of HOQ solution in two drops 5‒100 μg.
      PubDate: 2017-07-01
      DOI: 10.1134/s1061934817070115
      Issue No: Vol. 72, No. 7 (2017)
       
  • Detection of honey adulterations with sugar syrups by stable isotope mass
           spectrometry
    • Authors: O. V. Vetrova; D. A. Kalashnikova; V. N. Melkov; G. V. Simonova
      Pages: 756 - 760
      Abstract: Abstract A procedure is proposed for determining the quality of honey by measuring the isotope composition of carbon in the initial honey samples and their protein fractions by mass spectrometry. Seventeen samples of honey harvested in 2014 in various regions of Russia were investigated to identify falsifications with sugars or invert syrups. Using the data on the isotope ratios of δ13C of initial honey samples and protein fractions, the degree of adulteration of the test honey samples was determined. Concentration of sugar was used as a criterion of adulteration. According to the data obtained, in two samples of honey, the difference between the δ13C values in the protein fraction and the original honey was more than 1‰, indicating the dilution of these honey samples with cane sugar by more than 7%. It is shown that the isotope composition of honey is not only informative for detecting the adulteration of honey, but also can serve as a kind of marker for the geographical origin of honey.
      PubDate: 2017-07-01
      DOI: 10.1134/s1061934817070152
      Issue No: Vol. 72, No. 7 (2017)
       
  • Multi-residue determination of organochlorine pesticides in vegetables in
           Kirklareli, Turkey by gas chromatography–mass spectrometry
    • Authors: Cemile Ozcan; Seda Balkan
      Pages: 761 - 769
      Abstract: Abstract The aim of this study was to investigate the level of organochlorine pesticides use for treatment of tomatoes, eggplants and cucumbers in Kirklareli, Turkey. Eighteen organochlorine pesticides were identified in vegetable samples using microwave or Soxhlet extraction, and results were obtained by gas chromatography–mass spectrometry. The optimized conditions were 1 mL/min for flow rate in the mobile phase, 1 μL for injection volume and 70 V for fragmentation potential. The analytical parameters show that the microwave oven extraction procedure provided the best results when compared to the Soxhlet extraction procedure. Samples were prepared for analysis with hexane‒dichlormethane (1: 1, v/v, 40 mL) using a solid-phase extraction method. The limits of detection and quantitation for the eighteen analytes were between 0.02–0.26 and 0.06–0.87 μg/L, respectively, and the relative standard deviations of the migration time ranged from 2.4 to 8.9%. The recoveries of surrogate spiked in vegetable samples ranged from 70 to 116%, respectively. The obtained concentrations of pesticides in all vegetables studied were proved in the range of ND–123 μg/kg. The organochlorine pesticide sum was below the legal limit, except for Endrin and Methoxychlor, which requires a further elucidation of the organochlorine pesticides pollution sources in the region. These studies on accumulation of organochlorine pesticides were necessary for accomplishing a comprehensive ecological risk assessment.
      PubDate: 2017-07-01
      DOI: 10.1134/s1061934817070036
      Issue No: Vol. 72, No. 7 (2017)
       
  • Identification of (2-aminopropyl)benzofuran and its metabolites in human
           urine
    • Authors: A. V. Labutin; A. Z. Temerdashev
      Pages: 770 - 776
      Abstract: Abstract An HPLC−HRMS method for the detection of the benzofuran analog of amphetamine and its metabolites in human urine using both library search and target search of the most probable metabolites based on their calculated accurate weights and fragmentation regularities is proposed. The proposed method is confirmatory. Gas chromatography–electron impact mass spectrometry with library search is proposed as the main screening method.
      PubDate: 2017-07-01
      DOI: 10.1134/s1061934817070085
      Issue No: Vol. 72, No. 7 (2017)
       
  • A potentiometric sensor for determining E133 dye in beverages
    • Authors: K. V. Strelkova; O. V. Varygina; R. K. Chernova
      Pages: 777 - 782
      Abstract: Abstract An ion-selective potentiometric sensor with an ionophore is developed based on the ion associate of artificial food colorant E133 and a cetylpyridinium cation. The main electroanalytical parameters of the sensor are evaluated: linearity range of the response, pH effect, and the effect of temperature on the electrode performance and selectivity. The sensor is used to determine E133 in the Powerade beverage. The accuracy of the determination is confirmed by an extraction–photometric method.
      PubDate: 2017-07-01
      DOI: 10.1134/s1061934817070139
      Issue No: Vol. 72, No. 7 (2017)
       
  • Quantitative determination of diterpene acids in garden sage leaves
    • Authors: A. S. Khaliullina; R. Sh. Khaziev; A. A. Salamatin
      Pages: 810 - 814
      Abstract: Abstract A procedure is developed for the quantitative determination of diterpene acids in garden sage leaves by UV spectrophotometry at the wavelength 285 nm. The target group of compounds was selectively extracted by petroleum ether 40/70. It was shown that the completeness of extraction is determined mainly by the number of portions of the pure solvent: at the optimum ratio of the mass of the weighed portion to the volume of solvent 1 g/200 mL, double extraction is sufficient. The duration of each extraction is 20 min. The procedure was used in the analysis of samples of garden sage leaves from various producers. It was found that the concentration of diterpene acids in samples varied from 2.1 to 3.6 wt % (in terms of carnosic acid). The error of a single determination of the sum of diterpene acids in garden sage leaves is ±2.38% (P = 0.95).
      PubDate: 2017-07-01
      DOI: 10.1134/s1061934817070073
      Issue No: Vol. 72, No. 7 (2017)
       
 
 
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